57 lines
2.1 KiB
TypeScript
57 lines
2.1 KiB
TypeScript
const supportFiles = [{ type: 'image/png', ext: 'png' }, { type: 'image/jpeg', ext: 'jpeg' }, { type: 'image/gif', ext: 'gif' }, { type: 'image/webp', ext: 'webp' }, { type: 'image/jpg', ext: 'jpg' }, { type: 'image/x-icon', ext: 'ico' }, { type: 'application/x-ico', ext: 'ico' }, { type: 'image/vnd.microsoft.icon', ext: 'ico' }]
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const supportFile = 'image/png,image/jpeg,image/gif,image/webp,image/jpg,image/x-icon,application/x-ico,image/vnd.microsoft.icon'
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// 字符串编码
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export function randomString(value: number) {
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let baseStr = 'Aa0Bb1Cc2Dd3Ee4Ff5Gg6Hh7Ii8Jj9KkLlMmNnOoPpQqRrSsTtUuVvWwXxYyZz';
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const chars = baseStr.split('');
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let maxPos = baseStr.length;
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const uuid = [];
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let q = value;
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for (; q > 0;) {
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let mod = q % maxPos;
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q = (q - mod) / maxPos;
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uuid.push(chars[mod]);
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}
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return uuid.join('');
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}
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// 解析range
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export function parseRange(encoded: string | null): undefined | { offset: number, end: number, length: number } {
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if (encoded === null) {
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return
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}
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const parts = encoded.split("bytes=")[1]?.split("-") ?? []
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if (parts.length !== 2) {
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throw new Error('Not supported to skip specifying the beginning/ending byte at this time')
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}
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return {
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offset: Number(parts[0]),
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end: Number(parts[1]),
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length: Number(parts[1]) + 1 - Number(parts[0]),
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}
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}
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// 检查文件类是否支持
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export function checkFileType(val: string): boolean {
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return supportFile.indexOf(val) > -1
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}
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// 获取文件名
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export async function getFilePath(val: string, time: number): Promise<string> {
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const types = supportFiles.filter(it => it.type === val)
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if (!types || types.length < 1) {
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return val
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}
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const rand = Math.floor(Math.random() * 100000)
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const fileName = randomString(time + rand).concat(`.${types[0].ext}`)
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let date = new Date()
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const year = date.getFullYear() //获取完整的年份(4位)
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let month = date.getMonth() + 1 //获取当前月份(0-11,0代表1月)
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if (month < 10) {
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month = `0${month}`;
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}
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return `${year}/${month}/${fileName}`
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}
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